Hi,
I have a 2009 is250 for which I upgraded the satnav system to the latest maps just over a year ago. All done officially through Lexus.
I'm actually now getting rid of the car (trading it in) and a mate has just bought a 2009 isF. His motor has the same 5th generation satnav system as mine, but using older map disks.
Question is, I'd like to give him the newer maps from my car, but can I effectively downgrade my own satnav before trading it in by simply inserting my older disks (I did keep them after the upgrade)?
Bit frightened to just try it in case I 'brick' the system.
Any advice or help?